Ferdinand marohn



(No Model.)

F. MAROHN.

AUTOMATIC SAFETY GATE FOR DRAW BRIDGES.

No. 397,867. Y Patented Feb. 12-, 1889..

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FERDINAND MAROI'IX, OF AUSTIN, ILLINOIS, ASSIGNOR OF ONE-FOURTH TO \VILLIAM BODENSTAB, OF SAME PLACE.

AUTOMATIC SAFETY-GATE FOR DRAW-BRIDGES.

SPECIFICATION forming part of Letters Patent No. 397,867, dated February 12, 1889. Application filed November 23, 1888. Serial No. 291,638. (No model.)

To all whom it" may co/werm Be it known that I, FERDINAND llIAROHN,'a subject of the Emperor of Germany, residing at Austin, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Automatic Safety-Gates for Draw-Bridges, of which the following is a specification.

My invention relates to improvements in the class of gates designed to be employed at the approaches of a draw-bridge, and actuated, by the opening and closing of the draw, to bar access thereto while being opened and to the channel while the bridge is open, and by the closin g of the bridge to be removed to permit such access.

The object of my improvement is to provide a reliably-operating gate of the kind above mentioned, and which. shall involve a simple construction; and to this end my invention consists in the general construction of my improved dcvice, and also in details of construction and combinations of parts.

I11 the accompanying drawings, Figure 1 presents a plan, partly sectional, view of my improved mechanism applied to an abutment and to one end of a draw-bridge, so much of the latter and of the abutment being shown as will serve to permit the application of my improvement to be illustrated; and Fig. 2 is a section taken on the line 2 2 of Fig. 1, and viewed in the direction of the arrow.

A denotes an abutment of a draw-bridge, B. Toward the edge of the abutment is provided, transversely thereof, a slot containing a barrier, C, which may comprise a plate of sheet metal (which should then be galvanized) having, preferably at intervals on the surface facing the draw vertical racks '1'. It is, however, within the spirit of my improvement to provide only one rack on the barrier 0 when the rack should be near the center thereof.

In front of the gate C, below the surface of the abutment and longitudinally of the gate, is a rotary shaft, I), supported in suitable bearings, and carrying, coincident with each rack r, to mesh with the latter and rotate with the shaft, a cog-wheel r. Toward the center of the shaft D are two beveled gear-wheels, E and E, secured on the shaft to rotate with it.

i i l i F and F are two friction-wheels, formed preferably of paper, and supported on vertical axes q and q, near the front side of the abutment A, but at different planes, the wheel F beinglower than the wheel F, and the axes of 5 5 the said wheels carrying beveled pinions p and 13, respectively, above and below the wheels F and F, to be on the same horizontal plane.

G is a horizontal'rotary shaft supported to extend transversely to the shaft D, between the beveled gear-wheel. E and beveled pinion p, and carrying at opposite ends beveled gearwheels or and m, respectively, in mesh with the wheel E and pinion p. H is a rotary shaft, extending between the wheel E and pinion 1), parallel and on the same horizontal plane with the'shaft G, and carrying at its opposite ends beveled gear-wheels n and m, respectively, in mesh with the wheel E and pinion 1).

Rotation of the wheel F toward the left, or of the wheel F toward the right, will produce rotation of the shaft D in a direction which will cause the cog-wheels 0" to engage with the racks r in a manner to raise the gate C, and rotation of either of said wheels in the opposite direction will produce lowering of the gate.

At the ends of the floor-timbers I of the bridge are secured plates K and K, respect- 8o ively, in the planes at which the frictionwheels F and F are supported. These plates are convex horizontally on their .outer surfaces, and should be formed of metal; and each friction-wheel extends into the path of one of the plates. It is preferred, owing to the greater friction thereby produced, to render the plates K and K yielding. Accordingly I support them toward their ends on springs L, as shown.

The operation is as follows: The bridge B, as shown in Fig. 1, is closed and the gate Ois down. Vhen the bridge is opened, by turning it toward the left as the plate K comes with its convex surface into frictional contact with 5 the wheel F it turns the latter, thereby rotating the shaft D, through the intermediate mechanism, in a direction which causes the cog-wheels r to engage with the racks a" to raise the gate C; and if the bridge be opened, mo

by turning it to the right, contact of the plate K with the wheel F will produce a like result.

It may be here stated that the mechanism shown in the drawings as provided at one end of the bridge and at one abutment is likewise provided at the opposite end of the bridge and opposite abutment, the only difference at the opposite end being that the plate K is 011 the level shown of the plate K and the plate K 011 that shown of the plate K. Thus when thebridge is opened in either direction a plate at each end turns a shaft, D, to raise the barrier or gate C.

It the bridge be closed from its opened position, by returning the ends to the same abutments whence they were moved by the opening the gate will be lowered by the engage ment of the proper plates at opposite ends of the bridge (depending on the direction of turning the bridge) with the friction-wheels in their paths in a manner to rotate the shafts D in proper directions to cause the cogs r to force the racks 7' downward, and, obviously, the lowering of the barrier will likewise be effected if the bridge, to close it, be turned completely around from the position in which it was originally closed.

hat I claim. as new, and desire to secure b y Letters Patent, is

1. I11 combination with a draw-bridge and its abutment, a safety-gate, and means for opening and closing it by the swinging of the bridge, comprising a barrier, O, transverse of the abutment, and having a rack, "r, on one side, a rotary shaft, .1), carrying a cog-wheel, r, in mesh with the rack, friction-wheels l3 and E at different horizontal planes on the abutment and geared to the shaft D, and convex plates K and K, supported on an end of the bridge, respectivelyat planes corresponding with those of the wheels I and F, substantially as described.

2. In combination with a draw-bridge and its abutment, a safety-gate, and means for opening and closing it by the swinging of the bridge, comprising a barrier, C, transverse ot' the abutment, and having a rack, r, on one side, a rotary shal't, D, carrying a cog-wheel, r, in mesh with the rack, friction-wheels F and F at diflierent horizontal planes on. the abutment and geared to the shaft D, and yielding convex plates K and K supported on an. end of the bridge, respectively at planes corresponding with those of the wheels l? and F, substantially as described.

3. In combination with a draw-bridge and its abutment, a safety-gate, and means for opening and closing it by the swinging of the bridge, comprising a barrier, C, transverse of the abutment, and having at intervals on one side racks 0', a rotary shaft, 1), carrying cogwheels 7", in mesh with the racks, and beveled gear-wheels E and E, friction-wheels l1 and F, supported on vertical axes on theabutment at different horizontal planes, beveled pinionsp and p on the same plane on the said axes, rotary shafts G and It, each carrying at opposite ends beveled gear-wheels, respectively engaging with the wheel E and pinion 1) and the wheel E and pinion p, and eonvex plates K and K, supported on an end ol' the bridge against springs and respeeti vely at planes corresponding with those oi. the wheels I? and 'F, substantially as described.

FER-D'INAN I) MARO I IN.

In presence ol' M. J. Bownns, J. W. DVRENFORTIL 

